#include "Thread.h"
#include "CurrentThread.h"

#include <semaphore.h>

std::atomic_int Thread::numCreated_(0);

Thread::Thread(ThreadFunc func, const std::string &name)
    : started_(false), joined_(false), tid_(0), func_(std::move(func)), name_(name)
{
    setDefaultName();
}
Thread::~Thread()
{
    if (started_ && !joined_)
    {
        thread_->detach();
    }
}
void Thread::start() // 一个thread线程记录它详细的信息
{
    started_ = true;
    sem_t sem;
    sem_init(&sem, false, 0);
    thread_ = std::shared_ptr<std::thread>(new std::thread([&]()
                                                           {
                //获取线程的tid
                tid_ = CurrentThread::tid();
                sem_post(&sem);
    //开始一个新线程，专门执行该线程函数
                func_(); }));
    // 必须等待获取上面新创建的线程tid的值才可以继续执行
    sem_wait(&sem);
}
void Thread::join()
{
    joined_ = true;
    thread_ ->join();
}

void Thread::setDefaultName()
{
    int num = ++numCreated_;
    if (name_.empty())
    {
        char buf[32] = {0};
        snprintf(buf, sizeof buf, "Thread%d", num);
        name_ = buf;
    }
}